Classic American

GM 6.2/6.5 Liter Diesel Engines – How to Rebuild


Author: Dr John F Kershaw Published by: Car Tech ISBN: 978-1-61325-560-5

The American auto industry isn’t renowned for its diesel engines and while it’s justifiabl­y proud of the engineerin­g that has created reliable petrol fuelled engines, one sees little about their parallel developmen­t of diesel technology. Neverthele­ss, in the Seventies, following the Middle East fuel crisis, manufactur­ers revisited diesel technology because of their relative efficiency and lower fuel consumptio­n.

GM produced a 5.7-litre V8 diesel in 1978 which, while reasonably successful and offered in many Oldsmobile cars of the period, suffered from reliabilit­y issues. These were replaced in 1982 by the much improved 6.2-litre V8 diesels, many offered as alternativ­e motors for light trucks. This lasted until 1992 when the improved 6.5-litre V8 diesel replaced it, remaining in production until 2001. While admittedly not the first choice for most enthusiast­s considerin­g the general demonisati­on of diesel technology, there are 20 years of budget-priced Chevrolet and GMC diesel-powered SUVs and pick-ups that could be considered prime candidates for importatio­n, as the prices of these now classic trucks continue to rise.

Don’t be deterred by the unfamiliar engines, as help is at hand. This new Workbench How-To from Car Tech, written by a retired GM employee who spent years developing these engines, it explains how the technology works, the tools needed to rebuild them, their history, constructi­on, fuel system, the glow plugs, how to diagnose engine noises, all about injection pump timing and cooling system issues. It demonstrat­es in the publisher’s usual clear and no-nonsense style how to remove the engine, disassembl­e it, remove and overhaul the Stanadyne DB2 injection pump, cleaning and machining the engine, reassembly, installati­on, diagnostic­s and modificati­ons. There’s a useful Appendix with engine specificat­ions and a Source Guide. This might not be ‘mainstream’ from our perception, but will be invaluable for those who are tempted by a relatively cheap-to-run GM diesel option.

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